Allen-Bradley Controllogix 1756-EN2TXT Extreme Environment EtherNet/IP Module

Product Overview

The 1756-EN2TXT (1756-EN2TXT) is a ruggedized EtherNet/IP bridge specifically engineered for the ControlLogix platform. As part of the "XT" (Extended Temperature) line, this module is built to withstand rigorous industrial conditions that exceed the limits of standard control hardware. It provides high-capacity data routing and serves as a critical interface for distributed I/O, peer-to-peer interlocking, and HMI/SCADA connectivity. The hardware features specialized conformal coating, providing an extra layer of protection against contaminants and corrosive vapors.

Core Technical Specifications

• Network Throughput: 10/100 Mbps (Full or Half Duplex)

• TCP/IP Capacity: 128 Simultaneous Connections

• Logix Connections: 256 Maximum

• Packet Performance: 25,000 pps (I/O and Explicit Messaging)

• Backplane Current (5.1V DC): 1.0 Amps

• Backplane Current (24V DC): 3.0 mA

• Power Dissipation: 5.1 Watts

• Thermal Dissipation: 17.4 BTU/hr

• Isolation Voltage: 30V (continuous), Basic Insulation Type

• USB Port: Version 1.1 (Type B) for local configuration and programming

• Module Slot Width: 1 Slot (ControlLogix Chassis)

Extreme Environment Operating Parameters

• Operating Temperature Range: -25°C to +70°C (-13°F to +158°F)

• Storage Temperature Range: -40°C to +85°C (-40°F to +185°F)

• Relative Humidity: 5% to 95% (Non-condensing)

• Vibration Resistance: 2 g @ 10 to 500 Hz

• Shock (Operating): 30 g

• Shock (Non-operating): 50 g

• Conformal Coating: Factory-applied (Standard on XT models)

Application Scenarios

The 1756-EN2TXT is the industry standard for decentralized control in harsh locations. Typical deployments include:

• Mining & Metals: Reliable operation in high-vibration and dust-heavy processing plants.

• Wastewater Treatment: Resistance to corrosive gases and high humidity via conformal coating.

• Remote Power Generation: Stable communication in unconditioned cabinets subject to extreme seasonal temperature shifts.

Frequently Asked Questions

Q: Can I use the 1756-EN2TXT in a standard 1756-A7 chassis?A: Yes, the module is compatible with standard ControlLogix chassis, but to maintain the "Extreme Environment" rating for the entire system, it should be paired with other XT-rated components and chassis.

Q: Does the module support CIP Sync for motion applications?A: Yes, the 1756-EN2TXT supports CIP Sync (IEEE 1588 precision time protocol), making it suitable for synchronized distributed motion and high-precision sequence of events (SOE) applications.